ER40 Spare Nut is a replacement clamping nut used with ER40 collet chucks for secure tool holding in CNC & VMC machines.

Uses:

• Holds ER40 collets firmly in the chuck

• Ensures accurate tool clamping during machining

• Provides stability and reduces tool runout

• Ideal for milling, drilling, and tapping operations

• Useful as a spare or replacement nut in CNC workshops.